title: Physical forces exerted by microbubbles on a surface in a traveling wave field.
abstract: The effect of a wave with a varying traveling component on the bubble activity as well as the physical force generated by microbubbles on a surface has been studied. The acoustic emission from a collection of bubbles is measured in a 928 kHz sound field. Particle removal tests on a surface, which actually measures the applied physical force by the bubbles on that surface, indicate a very strong dependence on the angle of incidence. In other words, when the traveling wave component is maximized, the average physical force applied by microbubbles reaches a maximum. Almost complete particle removal for 78 nm silica particles was obtained for a traveling wave, while particle removal efficiency was reduced to only a few percent when a standing wave was applied. This increase in particle removal for a traveling wave is probably caused by a decrease in bubble trapping at nodes and antinodes in a standing wave field.
authors.affiliation: Imec vzw, Kapeldreef 75, B-3001 Leuven, Belgium. Electronic address: steven.brems@imec.be.
authors.forename: S
authors.initials: S
authors.lastname: Brems
authors.forename: M
authors.initials: M
authors.lastname: Hauptmann
authors.forename: E
authors.initials: E
authors.lastname: Camerotto
authors.forename: P W
authors.initials: PW
authors.lastname: Mertens
authors.forename: M
authors.initials: M
authors.lastname: Heyns
authors.forename: H
authors.initials: H
authors.lastname: Struyf
authors.forename: S
authors.initials: S
authors.lastname: De Gendt
mesh_terms: D045423:Microbubbles; D008846:Micromanipulation / Q000379:methods*; D053758:Nanoparticles / Q000737:chemistry* / Q000528:radiation effects*; D033081:Shear Strength / Q000528:radiation effects; D012822:Silicon Dioxide / Q000737:chemistry* / Q000302:isolation & purification / Q000528:radiation effects*; D013016:Sound; D013314:Stress, Mechanical
chemical_list: D012822:Silicon Dioxide
keywords: Particle removal; Sound emission; Standing wave; Traveling wave